Diagnostic Fault Information

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

DTC P18A8 will set with a hydraulic/mechanical condition.
The components are listed from the least to the most intrusive to service.

Component	DTC	Condition
M123 Transmission Park Valve Lock Solenoid Actuator	P18A8	Binding or Sticking/Stuck
Control Valve Body Control Valve Body Spacer Plate Park Servo Valve /Spring	P18A8	Oil Channels or Orifices - Blocked by debris/Restricted Valve - Binding or Sticking/Stuck

Component

DTC

Condition

M123 Transmission Park Valve Lock Solenoid Actuator

P18A8

Binding or Sticking/Stuck

Control Valve Body

Control Valve Body Spacer Plate
Park Servo Valve /Spring

P18A8

Oil Channels or Orifices - Blocked by debris/Restricted
Valve - Binding or Sticking/Stuck